After recently upgrading Firefox I noticed several old versions of the Java Console under the Add-ons section.  I could see the versions but could not uninstall them because the button was disabled.  Uninstalling Java removed the most current version but not the old versions.  After some digging I found that Firefox 3.6 started showing disabled add-ons.  I was able to remove the old add-ons by going to c:\program files\Mozilla Firefox\extensions and removing the folders starting with “{CCAFE”. [more]

While looking into this I found an free tool for automating the procedure to remove old versions of Java -